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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 241.0 | $ 1,510.4
Unrealized losses less than 12 months, gross unrealized losses | (3.1) | (49.1)
Unrealized losses more than 12 months, fair value | 4,176.7 | 3,538.3
Unrealized losses more than 12 months, gross unrealized losses | (147.0) | (149.4)
Total unrealized losses, fair value | 4,417.7 | 5,048.7
Total unrealized losses, gross unrealized losses | (150.1) | (198.5)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 71.7 | 731.7
Unrealized losses less than 12 months, gross unrealized losses | (0.8) | (26.0)
Unrealized losses more than 12 months, fair value | 2,137.6 | 1,886.9
Unrealized losses more than 12 months, gross unrealized losses | (68.9) | (70.6)
Total unrealized losses, fair value | 2,209.3 | 2,618.6
Total unrealized losses, gross unrealized losses | (69.7) | (96.6)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 159.6 | 631.4
Unrealized losses less than 12 months, gross unrealized losses | (2.0) | (17.6)
Unrealized losses more than 12 months, fair value | 1,550.3 | 1,221.9
Unrealized losses more than 12 months, gross unrealized losses | (58.3) | (58.4)
Total unrealized losses, fair value | 1,709.9 | 1,853.3
Total unrealized losses, gross unrealized losses | (60.3) | (76.0)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 9.7 | 102.7
Unrealized losses less than 12 months, gross unrealized losses | (0.3) | (4.4)
Unrealized losses more than 12 months, fair value | 375.4 | 324.6
Unrealized losses more than 12 months, gross unrealized losses | (15.0) | (15.5)
Total unrealized losses, fair value | 385.1 | 427.3
Total unrealized losses, gross unrealized losses | (15.3) | (19.9)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 44.6
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (1.1)
Unrealized losses more than 12 months, fair value | 113.4 | 104.9
Unrealized losses more than 12 months, gross unrealized losses | (4.8) | (4.9)
Total unrealized losses, fair value | 113.4 | 149.5
Total unrealized losses, gross unrealized losses | $ (4.8) | $ (6.0)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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